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w in (-oo:+oo)
(2/5)*w+5/7 = 82/105 // - 82/105
(2/5)*w+5/7-(82/105) = 0
(2/5)*w+5/7-82/105 = 0
2/5*w-1/15 = 0 // + 1/15
2/5*w = 1/15 // : 2/5
w = 1/15/2/5
w = 1/6
w = 1/6
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